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Distribution of nutrients and chlorophyll across an equatorial reef region: Insights on coastal gradients

Barroso, Hortência De Sousa; Lima, Isabelle De Oliveira; Bezerra, Antonia Diana Alves; Garcia, Tatiane Martins; Tavares, Tallita Cruz Lopes; Alves, Ravena Santiago; Souza Junior, Edmilson Ferreira De; Teixeira, Carlos Eduardo Peres; Viana, Michael Barbosa; Soares, Marcelo O.

Ocean and Coastal Research; Vol. 71 No. Suppl. 2 (2023): Environmental variability and hazards on the coastal and continental shelf regions of South America and the Caribbean

Instituto Oceanográfico - Universidade de São Paulo 2022-11-23

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  • Título:
    Distribution of nutrients and chlorophyll across an equatorial reef region: Insights on coastal gradients
  • Autor: Barroso, Hortência De Sousa; Lima, Isabelle De Oliveira; Bezerra, Antonia Diana Alves; Garcia, Tatiane Martins; Tavares, Tallita Cruz Lopes; Alves, Ravena Santiago; Souza Junior, Edmilson Ferreira De; Teixeira, Carlos Eduardo Peres; Viana, Michael Barbosa; Soares, Marcelo O.
  • Assuntos: Oligotrophic Sea; Nitrogen; Phosphorus; Chlorophyll; Coral Reef
  • É parte de: Ocean and Coastal Research; Vol. 71 No. Suppl. 2 (2023): Environmental variability and hazards on the coastal and continental shelf regions of South America and the Caribbean
  • Descrição: We evaluate how the concentrations of inorganic nutrients and chlorophyll a vary in a heterogeneous area (Equatorial SW Atlantic), covering a gradient from stations closer to the coast to others more distant associated or not with turbid-zone reefs. Vertical temperature (27.9 ± 0.10 °C; mean ± standard deviation) and salinity (36.2 ± 0.14) profles showed that the water column is well mixed (0-30 m depth). The oligotrophic condition was marked by low concentrations of phosphate (0.30 ± 0.22 µM) and dissolved inorganic nitrogen (0.64 ± 0.74 µM). Moreover, dissolved reactive silicon (DSi) was low in most samples (< 2.0 µM), but higher (>10 µM) in nearshore stations, probably related to continental runoff and/or resuspension of the bottom sediments. The pelagic phytoplankton biomass indicated that chlorophyll a (0.25 ± 0.08 µg L-1) was low, positively correlated with light and negatively correlated with nutrients, indicating possible phytoplankton uptake. Chlorophyll a concentrations were lower in stations closer to the coast and higher in some stations near the reefs, indicating that the latter could be more prone to phytoplankton development and depletion of nutrients, especially DSi. Therefore, although oligotrophy is present along this coast, we found some unexpected heterogeneity of nutrient and chlorophyll a distributions, which were probably infuenced by benthic-pelagic coupling due to the presence of extensive reefs, sponge gardens (18-30 m depth), and the proximity to the coast. These results highlight the importance of understanding the heterogeneity of ocean productivity, especially in lesser known low-latitude areas, which showed distinct nutrient and chlorophyll a levels re
  • DOI: 10.1590/
  • Títulos relacionados: https://www.revistas.usp.br/ocr/article/view/204804/188425
  • Editor: Instituto Oceanográfico - Universidade de São Paulo
  • Data de criação/publicação: 2022-11-23
  • Formato: Adobe PDF
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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